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Tailoring harmonic radiation to different applications using a genetic algorithm

Roos, L; Gaarde, M. B and L'Huillier, Anne LU (2001) In Journal of Physics B: Atomic, Molecular and Optical Physics 34(24). p.5041-5054
Abstract
We use a genetic algorithm to theoretically optimize several properties of extreme ultraviolet (XUV) radiation, generated as high-order harmonics in xenon and argon. We maximize the harmonic pulse energy, minimize the pulse duration or optimize the temporal coherence by varying at the same time two or three parameters that are easily accessible in experiments, related to the characteristics of the laser beam and the nonlinear medium. For the 15th and 29th harmonies in argon, we find up to 10(9) photons per pulse, and pulse durations as short as 6 fs generated by a 50 fs laser pulse. We can also tailor the phase matching conditions to spectrally select the transform-limited part of the harmonic radiation. This allows us to identify... (More)
We use a genetic algorithm to theoretically optimize several properties of extreme ultraviolet (XUV) radiation, generated as high-order harmonics in xenon and argon. We maximize the harmonic pulse energy, minimize the pulse duration or optimize the temporal coherence by varying at the same time two or three parameters that are easily accessible in experiments, related to the characteristics of the laser beam and the nonlinear medium. For the 15th and 29th harmonies in argon, we find up to 10(9) photons per pulse, and pulse durations as short as 6 fs generated by a 50 fs laser pulse. We can also tailor the phase matching conditions to spectrally select the transform-limited part of the harmonic radiation. This allows us to identify conditions when the time structure of the XUV radiation presents a train of attosecond pulses. We find that the optimum conditions for the different properties are in general not the same. They depend in particular on whether the harmonic belongs to the plateau or the cutoff region of the harmonic spectrum. This reflects the unavoidable interplay between the microscopic intensity-dependent harmonic phase and the macroscopic phase matching conditions imposed by a nonlinear medium interacting with an intense, focused laser beam. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics B: Atomic, Molecular and Optical Physics
volume
34
issue
24
pages
5041 - 5054
publisher
IOP Publishing
external identifiers
  • Scopus:0035966216
ISSN
0953-4075
DOI
10.1088/0953-4075/34/24/307
language
English
LU publication?
yes
id
9829fa53-097c-4a22-8d69-494cdcda3927 (old id 2259218)
date added to LUP
2012-02-10 00:56:52
date last changed
2016-10-23 04:30:12
@misc{9829fa53-097c-4a22-8d69-494cdcda3927,
  abstract     = {We use a genetic algorithm to theoretically optimize several properties of extreme ultraviolet (XUV) radiation, generated as high-order harmonics in xenon and argon. We maximize the harmonic pulse energy, minimize the pulse duration or optimize the temporal coherence by varying at the same time two or three parameters that are easily accessible in experiments, related to the characteristics of the laser beam and the nonlinear medium. For the 15th and 29th harmonies in argon, we find up to 10(9) photons per pulse, and pulse durations as short as 6 fs generated by a 50 fs laser pulse. We can also tailor the phase matching conditions to spectrally select the transform-limited part of the harmonic radiation. This allows us to identify conditions when the time structure of the XUV radiation presents a train of attosecond pulses. We find that the optimum conditions for the different properties are in general not the same. They depend in particular on whether the harmonic belongs to the plateau or the cutoff region of the harmonic spectrum. This reflects the unavoidable interplay between the microscopic intensity-dependent harmonic phase and the macroscopic phase matching conditions imposed by a nonlinear medium interacting with an intense, focused laser beam.},
  author       = {Roos, L and Gaarde, M. B and L'Huillier, Anne},
  issn         = {0953-4075},
  language     = {eng},
  number       = {24},
  pages        = {5041--5054},
  publisher    = {ARRAY(0xb1e7d38)},
  series       = {Journal of Physics B: Atomic, Molecular and Optical Physics},
  title        = {Tailoring harmonic radiation to different applications using a genetic algorithm},
  url          = {http://dx.doi.org/10.1088/0953-4075/34/24/307},
  volume       = {34},
  year         = {2001},
}